OK, here are the two versions of the spell, one a cantrip inspired by Harry Potter (thus the focus) and the other a new Power Word. Feedback appreciated. Thanks for all the help and suggestions so far.
Disarm
Enchantment (Compulsion)
Level: Sor/Wiz 0
Components: V, S, F
Casting Time: 1 Standard Action
Range: Close (25 ft. + 5 ft./2 levels)
Targets: One living creature
Duration: Instantaneous
Saving Throw: Will negates
Spell Resistance: Yes
With a flick of your wand and a single magic word, you cause the subject to drop whatever it is holding.
Focus: A wand
Power Word Disarm
Enchantment (Compulsion) [Mind-Affecting]
Level: Sor/Wiz 4
Components: V
Casting Time: 1 Standard Action
Range: Close (25 ft. + 5 ft./2 levels)
Targets: One living creature with 100 hp or less
Duration: Instantaneous
Saving Throw: None
Spell Resistance: Yes
You utter a single word of power that instantly disarms one creature of your choice, whether the creature can hear the word or not, causing the subject to drop whatever it is holding.
For each character level above the subject's character level, the dropped items travel 5 feet in a random direction. See the diagram on page 158 of the Player's Handbook to determine what direction the items are flung.
Any creature that currently has 101 or more hit points is unaffected by power word disarm.